20287109108 has 12 divisors (see below), whose sum is σ = 40574218272. Its totient is φ = 8694475320.

The previous prime is 20287109081. The next prime is 20287109119. The reversal of 20287109108 is 80190178202.

20287109108 is an admirable number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 362269778 + ... + 362269833.

It is an arithmetic number, because the mean of its divisors is an integer number (3381184856).

Almost surely, 2^20287109108 is an apocalyptic number.

20287109108 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

20287109108 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20287109108 is a wasteful number, since it uses less digits than its factorization.

20287109108 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 724539622 (or 724539620 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 38.

The spelling of 20287109108 in words is "twenty billion, two hundred eighty-seven million, one hundred nine thousand, one hundred eight".